Effect of the Crystallization Conditions of Alloy Mn.sub.54Al.sub.43C.sub.3 on the Magnetic Properties of Mechanically Milled Powder

Results of formation of a ferromagnetic [tau]-phase and an antiferromagnetic [epsilon]-phase in alloys of type Mn.sub.54Al.sub.43C.sub.3 obtained by induction and arc melting and by rapid hardening of the melt are presented. The magnetic hysteresis properties of powders produced by high-power mechanical milling of the synthesized alloys are studied. The optimum temperature conditions for transformation of the [epsilon]-phase into a ferromagnetic [tau]-phase are determined for the alloys and for their ultrafine powders. The resulting powders of Mn.sub.54Al.sub.43C.sub.3 have an ultimate specific magnetization [sigma].sub.m = 81 (G · cm.sup.3)/g and a coercive force H.sub.c = 3 kOe in a magnetic field of 12 kOe.